The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 08, 1985
Filed:
Jul. 23, 1984
Ashok K Mendiratta, Schenectady, NY (US);
Subhas K Sikdar, Boulder, CO (US);
General Electric Company, Schenectady, NY (US);
Abstract
Anhydrous di-(alkali metal) (especially disodium) salts of dihydroxyaromatic compounds such as bisphenol A are prepared by first contacting the solid dihydroxyaromatic compound with an aqueous alkali metal hydroxide solution so as to convert it into the solid di-(alkali metal) salt or hydrate thereof and subsequently separating the solid salt or hydrate from the aqueous system and removing water therefrom, typically by mixing the same with an organic liquid and removing water, including water of hydration, by evaporation. The organic liquid is preferably one such as toluene or o-dichlorobenzene in which water and the anhydrous di-(alkali metal) salt are substantially insoluble. The process may be operated in batch or continuous fashion.